1851 Great Exhibition: Official Catalogue: Class VI.: John Stafford MacKenzie
From Graces Guide
314. MACKENZIE, JOHN STAFFORD, Newark-upon-Trent - Inventor and Manufacturer.
A triturator, consisting of a mortar, fixed in a wooden frame, and a pestle, to which, by means of apparatus attached, a rotatory motion is given. This machine is useful for triturating or levigating various articles used in chemistry, particularly mercurial preparations, paints, printers' inks, and such articles as require continued friction and agitation.